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7365997 |
Synchronous switching control circuit for power converters
The present invention provides a synchronous switching control circuit for variable switching frequency power converters. It comprises a first circuit to generate a first signal in response to an...
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7362591 |
Power supply device and image forming apparatus
When a detected current value deviates from a range between an upper limit value and a lower limit value, a pulse width adjustment operation for increasing or decreasing a currently set counter...
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7333351 |
Electronic circuit control element with tap element
A technique for controlling a power supply with power supply control element with a tap element. In one embodiment, a power supply regulator includes a power transistor having first, second, third...
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7333142 |
Power supply apparatus and actuator control apparatus
In accordance with the switching operation of a switching section, current is made to flow from a battery to an inductor repeatedly. A voltage generated at the inductor is smoothed by a condenser...
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7327178 |
Timing control circuit for lossless switching converter
A timing control circuit ( 70 ) generates staggered signals from a pulse width modulated signal ( 68 ) providing lossless switching in a DC to DC power converter ( 10 ). The DC to DC power...
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7327113 |
Electric starter generator system employing bidirectional buck-boost power converters, and methods therefor
A bidirectional buck-boost power converter 13 including a pair of inverter modules 14, 15 disposed at an output of a machine, and an inductor L o connected between the pair of inverter modules...
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7321499 |
Method of forming a power supply controller and device therefor
In one embodiment, a power supply controller uses a ramp signal to form current sense ramp compensation.
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7313005 |
PWM circuit control method
In the PWM circuit of the present invention, a PWM counter counts clock signals. A reference value setting register sets a comparative reference value for determining a duty ratio of a PWM signal....
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7312783 |
Light emitting element drive device and display apparatus
A light emitting element drive circuit and a display system able to simultaneously perform constant current control and PWM control and able to perform a stable adjustment of luminance over a wide...
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7280375 |
Circuit arrangement for operating at least one light-emitting diode
A circuit arrangement is for operating at least one light-emitting diode LED in an electrical circuit at a service voltage greater than the forward voltage of the at least one light-emitting diode....
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7274575 |
AC coupled bias circuit for power converters
A switching power system for converting an input voltage to an output voltage across a transformer is disclosed. The system includes a control circuit. The control circuit has a control input...
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7265506 |
Noise improved linear DC motor control systems and methods
A linear power controller and related circuitry may be implemented to provide linear control of a variable DC electric motor. The controller and motor are coupled to form a closed loop for...
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7254045 |
Power supply circuit and electronic equipment
A power factor is improved using a simplified structure without particularly providing a power factor improving circuit, and high efficiency is obtained. For this purpose, one terminal of a...
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7236376 |
Controller for regulating output current at the primary side of a power supply
A controller controlling the output current at the primary side of a power supply is provided. A waveform detector generates a current-waveform signal. A second control circuit generates an...
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7212415 |
Resonance type switching power source
A control circuit 6 of a resonance type switching power source comprises a drive circuit 21 for supplying drive pulses to each gate terminal of first and second MOS-FETs 2,3 ; a PWM circuit 9...
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7200014 |
System and method for transferring duty cycle information in an isolated DC/DC converter or other circuit
A signal processing methodology and circuit for supplying bias power and duty cycle information across an isolation barrier, wherein, at an input side of the isolation barrier at least one input...
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7199643 |
Hot swappable pulse width modulation power supply circuits
Hot swappable pulse width modulation power supply circuits preferably realized in integrated circuit form. The hot swap circuits provide for de-bouncing, controlled charging of the input capacitor...
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7196479 |
Electronic ballast having a protective circuit for a switching transistor of a converter
The invention relates to an electronic ballast for lamps having a converter, in which a switching transistor is protected against transient disturbances by a detection circuit C 1 , C 2 , R 1 , R 2...
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7167028 |
Voltage detection circuit, power supply unit and semiconductor device
An output signal of an error amplifier 5 , which has a reference terminal to which a voltage having no temperature characteristics fluctuation is applied and which has a detection terminal to...
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7164589 |
Bridgeless bi-directional forward type converter
A circuit is provided for converting power from an AC power source to DC power. The circuit including bi-directional switches capable of conducting and blocking a current flow in both directions....
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7136292 |
Power supply and method for regulating supply voltage
In a preferred embodiment, there is provided a switched mode power supply operable in start-up mode, normal mode and standby mode. The power supply may comprise a transformer having a primary...
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7130201 |
Power supply device for outputting stable programmable power supply
The present invention discloses a power supply device for outputting a stable programmable power supply, which comprises a transformer disposed at a DC output end of the power supply device, and a...
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7116563 |
Dual mode over-current protection for switching mode power converter
A control circuit for a switched mode power converter is adapted to receive a current sense signal reflecting the output current of the power converter and a feedback signal reflecting the output...
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7102900 |
Electronic circuit control element with tap element
A technique for controlling a power supply with power supply control element with a tap element. In one embodiment, a power supply regulator includes a power transistor having first, second, third...
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7088597 |
High voltage supply device for eliminating a surge voltage
A high voltage supply device including a power supply rectifying an externally inputted ac voltage and generating a first dc voltage and a second dc voltage, a controller generating a pulse signal...
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7079405 |
Thermal conductive polymer molded article and method for producing the same
A thermal conductive polymer molded article is formed by molding a thermotropic liquid crystalline composition comprised mainly of a thermotropic liquid crystalline polymer, wherein the thermal...
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7072191 |
Switching power source circuit for independent per cycle control of ON/OFF time ratio
A switching power supply circuit, which can respond to a rapid and large change in a load quickly and stably and ensure a power supply output having a predetermined voltage, is provided. In the...
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7038432 |
Linear predictive controller
A linear predictive system for a DC—DC converter including a linear predictive controller, first and second adders and a multiplier. The DC—DC converter generates an output signal and includes...
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7006364 |
Driving circuit for DC/DC converter
A driving circuit comprises an input terminal receiving an input of a PWM signal, a first output terminal connected to a main switch for outputting a low-side driving signal, a second output...
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7006363 |
DC-DC converter circuit having correction circuit for outputting voltage level inversely proportional to input voltage
A DC-DC converter circuit for stabilizing the output voltage of the secondary side by correcting the input voltage by using a simple circuit, where no state measurement circuit is necessary at the...
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6980442 |
384X-based burst mode PWM controller
A 384X-based burst mode PWM controller includes an oscillator to generate a pulse signal of a constant frequency, an output circuit to generate an output signal based on the pulse signal, an error...
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6977826 |
Voltage regulator and method for regulating voltage
A voltage regulator for use in a charging device of a portable electronic apparatus is disclosed. The voltage regulator includes a transformer having a primary winding and a secondary winding, a...
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6970364 |
Low cost AC/DC converter with power factor correction
A high performance single stage Power Factor Correction (PFC) converter with tight output voltage regulation and a very simple circuit to carry out those functions, which means its cost is lower...
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6914409 |
Current detection method and control apparatus for electric motor
A current detection method for an electric motor which detects phase currents of the electric motor driven by a power converter that provides ON/OFF control of bridge-connected switching elements,...
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6906934 |
Integrated start-up circuit with reduced power consumption
A switching power supply control-circuit according to the present invention uses bleeding resistors to charge a start-up capacitor and discharge an EMI filter. No extra discharge device is needed...
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6900996 |
Method and apparatus for controlling a DC-DC converter
Method and apparatus for controlling a DC-DC converter change the switching frequency of the switching devices and the on-off ratio of the switching devices. The on-off ratio can be changed in...
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6856523 |
Level shifted drive for clamp device
A DC/DC converter device is provided that employs a clamp device to limit the peak voltage of a main power switch coupled to a primary winding of a transformer. The clamp device is driven employing...
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6763314 |
AC defect detection and failure avoidance power up and diagnostic system
A system for modifying the power up and diagnostic procedure of systems such that the system voltage is lowered to a predetermined voltage level that has been shown to detect delay faults. The...
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6757183 |
Method for starting up a switched-mode power supply, and switched-mode power supply having a starting circuit
To start a switching power supply in an energy saving manner, the method and device according to the invention transmits the energy that is collected by the Y-capacitors through a diode to a...
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6683797 |
Multi-stage DC—DC converter
A multi-stage DC—DC converter is provided that utilizes multiple loops in the control system to perform stable operation. The multi-stage DC—DC converter includes: a first DC—DC converter, a...
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6674656 |
PWM controller having a saw-limiter for output power limit without sensing input voltage
A PWM controller having a saw-limiter for power limit without input voltage sensing. The saw-limiter has an adder, a reference voltage, a scaler and a saw-tooth signal that is generated by the PWM...
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6650553 |
Isolated switching power supply having volt-second clamping circuit
An isolated switching-mode power supply with a volt-second clamp circuit is provided. A control circuitry for an isolated switching-mode power supply includes a transformer having a primary winding...
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6646897 |
Method and system of slow output voltage ramp control for a power supply
A pulse width modulation controller is coupled to a feedback voltage that is proportional to the power supply output voltage. The controller adjusts a current sense threshold in the controller in...
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RE38196 |
Control of stored magnetic energy in power converter transformers
Apparatus (and a method) useful in a switching power converter having a transformer and a primary switch for connecting a DC input source to a primary winding of the transformer during a portion of...
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6567261 |
DC-DC step-down converter with super capacitor
A voltage regulator module includes a power supply circuit for supplying power to an integrated circuit, the power supply circuit including semiconductor switching devices and a drive circuit for...
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6549430 |
Switching power supply circuit having constant current circuit
A switching power supply circuit including a transformer having a primary winding, a secondary winding, and a feedback winding; a direct-current power supply of which one end is connected to one...
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6490184 |
Auxiliary output voltage control implemented with a bi-directionally magnetizing magnetic amplifier
The present invention discloses forward power converter. The power converter includes a transformer for transferring an input voltage from a primary side to a secondary side. The secondary side...
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6434025 |
Power supply unit
The invention relates to a power supply unit which can fail-safely monitor not only for an excessive power supply output but also for an abnormal drop in output level. At the time of start-up, with...
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6411119 |
Switched-mode power supply and method for determining the supply voltage in a switched-mode power supply
A switched-mode power supply has a switch for a pulsed application of a variable supply voltage to a primary coil of a transformer. The power supply has a first current measuring configuration for...
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6400582 |
Dual forward power converter utilizing coupling capacitors for improved efficiency
A dual forward power converter and method of operation thereof. The dual forward power converter includes first and second power transformers, where each of the power transformers has first and...
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